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- W64182065 abstract "The addition of steel fiber has a positive effect on the mechanical properties of concrete. In this sense, we can refer to the simultaneous improvement in the ductility and in the tensile strength of the concrete material. Furthermore, both the formation and the propagation of the cracks are delayed and the opening width of these cracks is greatly reduced. However, the introduction of fibers in concrete has a harmful effect on the rheology of concrete and thus on its workability at the fresh state. Consequently, the orientation of fibers within the concrete matrix is greatly affected. The effect of this orientation on the mechanical properties of the material is certain. At first, this work attempts to characterize the orientation of the fibers in a simple model material, having a rheological behavior similar to that of concrete. The results showed that the shearing threshold of the fresh material is the fundamental rheological variable which determines the orientation and the homogeneity of the distribution of fibers. Thereafter we present the influence of the rheology of the fresh concrete material on the orientation of the steel fibers for concrete specimens. The results confirm that the rheology of the fresh concrete material is an essential parameter for the orientation and the distribution of fibers within concrete. Experimental tests are carried out in compression, in splitting, in direct shear and in flexural bending on concrete moulds and on concrete beam specimens made of different configurations of concrete (ordinary concrete, self compacting concrete and high performances concrete). A highly performing technique consisting of a numerical recording camera was used for the detection of the first cracking and its propagation. These tests highlight that the fundamental characteristic of fiber concrete is its post cracking ductile behaviour expressed mathematically by the ductility indexes. Relations between the mechanical characteristics of the composite material were derived according to the various studied parameters." @default.
- W64182065 created "2016-06-24" @default.
- W64182065 creator A5021552773 @default.
- W64182065 date "2010-01-01" @default.
- W64182065 modified "2023-09-27" @default.
- W64182065 title "Étude des bétons de fibres métalliques avec référence aux propriétés rhéologiques et de ductilité sous sollicitations de compression, fendage, cisaillement direct et flexion" @default.
- W64182065 hasPublicationYear "2010" @default.
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